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CLP VOA CAL2000 MegaMix Standard (28 components)

CLP VOA CAL2000 MegaMix Standard (28 components)

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Catalog # 30632
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Catalog #
30632 ea. 2,000 µg/mL each in P&T methanol, 1 mL/ampul CLP VOA CAL2000 MegaMix Select Deselect
Units
ea.  
Conc. in Solvent and Volume
2,000 µg/mL each in P&T methanol, 1 mL/ampul  
Product Name
CLP VOA CAL2000 MegaMix  
Certified Reference Material (CRM)
Yes  
Max Shelf Life on Ship Date
60 months  
Min Shelf Life on Ship Date*
6 months  
Shipping Conditions
Ambient  
Storage Temperature
0 °C or colder  

    Benzene (71-43-2)
    Bromodichloromethane (75-27-4)
    Bromoform (75-25-2)
    Carbon disulfide (75-15-0)
    Carbon tetrachloride (56-23-5)
    Chlorobenzene (108-90-7)
    Chloroform (67-66-3)
    Dibromochloromethane (124-48-1)
    1,1-Dichloroethane (75-34-3)
    1,2-Dichloroethane (107-06-2)
    1,1-Dichloroethene (75-35-4)
    cis-1,2-Dichloroethene (156-59-2)
    trans-1,2-Dichloroethene (156-60-5)
    1,2-Dichloropropane (78-87-5)
    cis-1,3-Dichloropropene (10061-01-5)
    trans-1,3-Dichloropropene (10061-02-6)
    Ethylbenzene (100-41-4)
    Methylene chloride (dichloromethane) (75-09-2)
    Styrene (100-42-5)
    1,1,2,2-Tetrachloroethane (79-34-5)
    Tetrachloroethene (127-18-4)
    Toluene (108-88-3)
    1,1,1-Trichloroethane (71-55-6)
    1,1,2-Trichloroethane (79-00-5)
    Trichloroethene (79-01-6)
    m-Xylene (108-38-3)
    o-Xylene (95-47-6)
    p-Xylene (106-42-3)

Why don’t MegaMix mixtures contain ketones required by the methods?
In methanol solution, ketones can interact with other compounds, resulting in a methoxy addition to the ketone.[1] The presence of halogenated compounds greatly speeds the reaction, limiting shelf-life to less than two months. Because none of eighteen preservatives (including water) was successful at inhibiting the reaction, we do not combine ketones with halogenated compounds in any of our calibration mixtures.
[1] A comparison of ketone stability in calibration mixes for EPA Method 524.2 Revision 4.0, Christopher Cox, et. al., 1997 Pittsburgh Conference on Analytical Chemistry and Applied Spectroscopy, poster number 467P.